Why is Code: Jie frame time spiking to 42ms with my Great Wall GW3500 512GB SSD?

I was angry when Code: Jie frame time spiked from 8ms to 42ms during combat. I tried disabling the camera, but it broke my stream. I used GamePP Peripheral Driver Conflict Detection Tool to set Synapse to Manual. RivaTuner confirmed frame time stabilized at 7-11ms. Task Manager showed CPU usage at 62-70%. The combat is now smooth, so I can backup my progress.